TWI230299B - Hollowed backlight module - Google Patents

Abstract

There is provided a hollowed backlight module, which includes a first light conducting plate, a second light conducting plate, two side light sources, a reflective sheet and a diffusing plate. A hollowed light conducting area is formed between the first light conducting plate and the second light conducting plate. Two side light sources are arranged at two sides of the hollowed light conducting area, respectively, wherein the reflective sheet is arranged at the outer surface of the second light conducting plate and the diffusing plate is arranged on the outer surface of the first light conducting plate. When the light of the side light source is emitted into the hollowed light conducting area, it enters the first light conducting plate and the second light conducting plate, respectively, wherein the reflective sheet can reflect the light penetrating from the second light conducting plate to the hollowed light conducting area, and the diffusing plate can diffuse the light coming from the first light conducting plate and output uniform light.

Description

1230299 V. Description of the invention (1) The technical field to which the invention belongs ... The present invention relates to a backlight module for a liquid crystal display, and particularly to a hollow backlight module. Advanced technology · With the rapid progress of thin-film transistor (TFT-LCD) manufacturing technology, and its advantages such as light / specialized, power saving, and no radiant rays, LCD displays are widely used in personal digital assistants ( PDA), notebook computers, digital cameras, camcorders, mobile phones and other electronic products. Coupled with the industry's active investment in research and development and the use of large-scale production equipment, please refer to the cross-sectional view of the liquid crystal display (see the design of the device), the thin film 15 force plate 'the diffused light guide will expand the light The light-emitting surface 12 is emitted through a plurality of backlights that can be expanded without using a collar device, and the reading is always the following formula, and the diffusion includes a plate 1 1 diffuse. Reflective light reflection sheet diffuses the light guide, and only improves the function of the II, and the price and group can produce the display function. The direct-type backlight module is aimed at large-size liquid crystal display diffuse light guide plates (diffUSer). Sheet 1 3, a frame 1 4 and a plurality of white translucent acrylics and a light emitting surface (upper surface), 2 diffusion particles (not shown) can be distributed on the diffusion light guide plate Π in the lamp tube 12 Right below the 'light tube', the remaining light V is on the board 1 丨. The frame 4 is expanded rapidly. However, since the LCD is non-luminous, it needs to be shown by the backlight mode. It is a normal backlight module 10, It includes a light tube 1 2. A reflective light guide plate 1 1 is a light-incident surface (lower surface). There are a plurality of light tubes inside. The reflection of 3 enters the lower surface of the plate 11, and s 1 2 and the reflection sheet 1 3 cover

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In order to protect the light plate 11 inside the backlight module 20, a plurality of thin layers are provided on the front surface. In addition, ‘diffusion is generated? The fixed optical effect allows the backlight module 10 to die and the film can be produced to provide a liquid crystal display (the picture does not show a uniform light source). 'The light required when not wearing a shirt is distributed throughout the expansion. The diameter of 2 to 4 mm is too short, and the number of times is limited *, but there is no output. At the same time, the high-gloss plate that is generated will be transmitted to the crystal to affect the ground, which makes the backlight module not committed to learning The lack of known technology is more uniform, k 幵 LCD display. Summary of the invention: The conventional technology diffuses the light guide plate, and the light is caused by the diffusion method. The diffusion of the backlight is easily caused by the conventional method. Moreover, the light is expanded by the light. As a whole, for the point of knowing the technology, a light flux is better than that of the display device. The technology of the light guide plate inside the diffused light guide plate is shown below. Diffusion guide light guide plate and LCD liquid crystal display backlight module better solution, as well as the diffusivity and quality of the light from the light emitting surface of the interior of the board The internal display of the light panel is changed. The thermal effect is that the diffused light exit surface is expanded by the cable, and the uniform backlight mode effect cannot be obtained. The internal effect of the liquid crystal obscuration rate is observed. It is good in the industry, so that the scattered particles emitted from the thickness of a plurality of plates are evenly covered by a uniform light group, which makes the display pass through the display higher, lower, and quality. The staff can then design the flatness of the backlight mold tube. Generally, the ground diffusion line scattered by the light guide path is converted into a tube, and the internal liquid is diffused and the relative influence is affected.

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1230299 V. Description of the invention (3) The main object of the present invention is to provide a hollow backlight module, which can produce a light output with better uniformity to improve the viewing quality of the liquid crystal display. Another object of the present invention is to provide a hollow backlight module, which can increase the luminous flux of light inside the backlight module to increase the brightness output of the backlight module. Yet another object of the present invention is to provide a hollow backlight module, which can improve the heat dissipation efficiency of the backlight module to avoid the temperature of the backlight module from increasing and affecting the quality of the liquid crystal.

The hollow backlight module disclosed in the present invention includes a first light guide plate, a second light guide plate, two side light sources, a reflection sheet, and a diffusion plate. The first light guide plate is a transparent acrylic plate, which includes a first inner surface and a first outer surface. The two surfaces are both concavely curved surfaces. The diffuser plate is placed on the first outer surface. Above, and the first inner surface is formed with a plurality of diffusion patterns by injection molding. The second light guide plate is also made of a transparent acrylic plate, and includes a second inner surface and a second outer surface. The first light guide plate and the second light guide plate correspond to each other, and A hollow light-guiding area is formed between the two sides of the light-guiding area. The second inner surface is a concave curved surface design, and the second outer surface is formed by screen printing. A diffusion pattern and a reflection sheet are disposed below the second outer surface. The side light source is composed of a plurality of lamp tubes and a reflective lampshade. The light emitted by the side light source first enters the hollow light guide area, and then enters the first light guide plate and the second light guide plate, respectively. The concave curved surface of the second inner surface is designed to

Page 7 1230299 ^ —_ V. Description of the invention (4) Two: Two: the surface diffusion pattern 帛, the light that enters the light guide plate can be in the intelligent = anti = empty light guide area; and after the- The diffusion of the:, i on the curved surface and the diffuser plate is used for the LCD display in the image = ;: 2; the original = turns out to highlight the first light guide plate and the first source. Among them, the side light source is easier to generate the energy, and the structure of the board is set, so that the side light source ...... Yue Ding Gu Yi Zheng Kai, to avoid mentioning the above description, we can see that the original / Jiuqi, and the degree of service. Type backlight module, of which two guides: 〃 a hollow light guide plate composed of a hollow lens-like diffusion function, ^ = using concave curved surface design, can produce light output. In addition, because the backlight module of the invention invents a uniform light guide to form a hollow light guide & February moonlight module in the air of the two light guide plates, it has a rate of :::::, the main medium of the department is to make The backlight module of the present invention provides ::: Characteristics' Only to the ground, and the side light source that can be seen is exposed = redundant and rotating. In addition, since the light can only combine the light of the lamp tube to the two sides of the backlight module, it can direct the backlight module 不管 regardless of the heat generated, and it can also make the lamp reduce the amount of light generated by the lamp tube: Impact. Ding 4 caused by the abnormal liquid crystal In order to make the review more effective-a better understanding and recognition of the effect is provided. The detailed description of the diagram is as follows:

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1230299 V. Description of the invention (5) Figure 1 is a cross-sectional view of a direct type backlight module of the conventional technology; Figure 2 is a schematic view of a hollow backlight module of the present invention. 11 ~ light guide plate 1 3 ~ reflective sheet 1 5 ~ film 2 1 ~ first light guide plate 212 ~ first outer surface 22 ~ second light guide plate 222 ~ second outer surface 2 3 ~ side light source 2 3 2 ~ reflective lampshade 2 5 ~ diffuser plate 2 7 ~ fluorescent paint pattern drawing description 1 0 ~ backlight module 1 2 ~ lamp tube 1 4 ~ frame 2 0 ~ backlight module 211 ~ first inner surface 2 1 3 ~ reflective tape 221 ~ Second inner surface 2 2 3 ~ Reflective tape 2 3 1 ~ Lamp tube 2 4 ~ Reflective sheet 26 ~ Hollow light guide zone Application method: The present invention discloses a hollow backlight module, the hollow backlight module The structural design can make the light output uniformly, and obtain higher luminous flux and heat dissipation efficiency. The best embodiment and related implementations will be described in detail through the following content. Please refer to FIG. 2, which is a schematic diagram of a hollow backlight module 20 according to the present invention, including a first light guide plate 21, a second light guide plate 22, two side light sources 23, a reflection sheet 24, and a diffusion plate. 25. The first light guide plate 21 in the figure is a transparent acrylic plate, which includes a first inner surface 211 and a first outer surface 212, both of which are

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Page 1230299 V. Description of the invention (7) The light plate 21 and the light source 23 respectively enter the light plate 2 2 and the outer surface 2 2 2 of the wire is guided back to the hollow through the first inner, and the first 'in the backlight module length : For the liquid crystal display a light guide plate 2 2 is provided with a tube 2 31 between the first light guide plate 21 and the first line, which can be diffused by the diffusion pattern of the second inner surface, and then the light area 26. The indicator above the diffuser plate 25 that enters the concave curved surface outer surface 212 of the concave curved surface 20 of the first surface 211 is displayed when the image is displayed to increase the haiku degree of the backlight. The backlight module 20 is hollow at the first _ $. The light guide region 26, so the two sides first enter the hollow light guide region 26, the light guide plate 22. The concave curved surface incident on the second guide surface 221 and the first reflection through the reflecting sheet 24 will convert the light from the light guide plate 21 to the diffusion surface of the diffusion pattern thereon and the diffusion plate 25 to be uniform after diffusion. Light output to the required light source. In summary, the present invention ' s hollow backlight module has the following advantages: 1. Since the backlight module of the present invention forms a hollow light guide area between two light guide plates, the medium in this area is mainly air, and It has the characteristics of low shielding rate and high luminous flux. Compared with the conventional technology, the f-light module of the present invention can provide higher brightness output. 2. Since the first light guide plate and the first light guide plate of the present invention have a concave concave curved surface design similar to that of the concave lens, the above two light guide plates can have the same diffusion effect as the concave lens. Compared with the known technology, the present invention The backlight module can produce a more uniform light output. 3. Since the two-side light source of the present invention is coupled to the two sides of the backlight module, and the lamp tube and the reflective cover are exposed outside the backlight module body, not only the light from the lamp tube can be directly introduced into the backlight module. And the heat generated by the lamp

1230299 V. Description of the invention (8) It is released directly from the two sides of the backlight module and the reflective sheet below, so it can reduce the heat transferred from the lamp to the liquid crystal display to reduce the effect of temperature on the liquid crystal. In comparison, the backlight module of the present invention can obtain better image quality. Of course, the above is only a preferred embodiment of the hollow backlight module of the present invention, and it is not intended to limit the scope of implementation of the present invention. Any modifications made by those skilled in the art without departing from the spirit of the present invention are It should belong to the scope of the present invention, so the protection scope of the present invention should be based on the scope of patent application described below.

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Claims (1)

1230299 VI. Scope of patent application Scope of patent application 1. A hollow backlight module comprising: a first light guide plate having a first inner surface and a first outer surface, wherein the first inner surface is a concavely curved surface Design; a second light guide plate having a second inner surface and a second outer surface, wherein the second inner surface is a concavely curved design, and a hollow is formed between the second light guide plate and the first light guide plate Light guide area; two side light sources are set on the two sides of the hollow light guide area, and the emitted light sources first enter the hollow light guide area, and then enter the two light guide plates from the two inner surfaces, respectively; The reflection sheet is disposed on the second outer surface of the second light guide plate, and can reflect the light that has passed through the second light guide plate back to the second light guide plate and then enter the hollow light guide area; and a diffusion plate, The first light guide plate is arranged on a first outer surface of the first light guide plate, and can diffuse light emitted from the first light guide plate and output uniform light. 2. The hollow backlight module according to item 1 of the scope of patent application, wherein the first light guide plate and the second light guide plate are made of a transparent acrylic material. 3. The hollow backlight module according to item 1 of the scope of patent application, wherein the first outer surface of the first light guide plate is a concavely curved design. 4. The hollow backlight module according to item 1 of the scope of patent application, wherein the first inner surface of the first light guide plate is formed by a plurality of diffusion patterns through an injection molding method. 5. The hollow backlight module described in item 1 of the scope of patent application, wherein the first Page 14 1230299 VI. Scope of patent application The second outer surface of the two light guide plates is formed with a plurality of diffusion patterns by screen printing. 6. The hollow backlight module according to item 1 of the scope of the patent application, wherein a reflective tape is attached to the two side surfaces of the first light guide plate and the second light guide plate to prevent light from being bubbled from the side surface. 7. The hollow backlight module according to item 1 of the scope of patent application, wherein the material of the reflective sheet is aluminum or its alloy. 8. The hollow backlight module described in item 1 of the scope of patent application, wherein the surface of the diffuser plate is coated with a layer of fluorescent paint, which can temporarily keep the light incident on the diffuser plate for a period of time and diffuse the light. Shot afterwards. 9. The hollow backlight module according to item 1 of the scope of patent application, wherein each of the above side light sources is composed of a plurality of lamp tubes and a reflective lampshade. 10. The hollow backlight module according to item 9 of the scope of the patent application, wherein the reflective lampshade and the plurality of lamp tubes are arranged to protrude from the first light guide plate and the second light guide plate, and the plurality of lamp tubes are provided. The generated light is guided by the two sides of the hollow light guide area. Page 15